Machine for grinding the lateral faces of piston-rings.



D, F. DOMlZI.

MACHINE FOR GRINDING THE LATERAL FACES or PISTON RINGS.

APPLICATIDN FILED JAN-20' 1912.

PatentedMay 18; 1915.

5 SHEETS-SHEET I.

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DAV/D FT DOM/Z/ THE NORRIS P575451 C0,, PHOTO-LITHOH WASHINGTONv D. c.

D. F. DOMIZI.

MACHINE FOR GRINDING THE LATERAL FACES 0F PISTON RING-S.

APPLICATION FILED JAN-20. 1912.

1,139,649. Patented May18,1915.

5 SHEETS-SHEET 2.

llllllllfl THE Nwems PEIbRL c0 PHUTOLIIHCL. wnsmmzmzv, u. (.1

Patented May 18, 1915.

5 SHEET$-SHEET 3.

I mum x to: DAV/D Ff DOM Z/ D. F. DOMIZI.

MACHINE FOR GRINDING THE LATERAL FACES 0F PISTON RINGS.

'IIIIIIIIIIIIIIIIIIIAIIIIII APPLICATION FILED JAN.20. I912. 1,139,649.

l/ vvbaooeo I THE NORRIS PETERS c0 PHOTO-LITHO.. WASHINGTON. D.

D. F. DOMIZI.

MACHINE FOR GRINDING THE LATERAL FACES 0F PISTON RINGS.

APPLICATION FILED IAN-20,19I2.

Patented May 18, 1915.

5 SHEETS-SHEET 4.

ammo I DAV/D F. DOM/Z1 Wmwu - 'HE NORRIS PETERS CO.. PHOTO-LITHOUWASHINGTON. D. C.

D. F. DOMIZI.

MACHINE FOR GRINDING THE LATERAL FACES 0F PISTON RINGS.

APPLICATION FILED IAN.20, I9I2.

" Patented May18,1915.

5 SHEETSSHEET 5.

@Iwvwwtoz DAVID F: DOM/Z1 THE NORRIS PETERS CQ. PHOTaLITHcL. WASHINGTON,D. L

DAVID F. DOMIZI, OF FRANKLIN, PENNSYLVANIA.

MACHINE FOR GRINDING- TI-IE LATERAL FACES OF PISTON-RINGS.

Specification of Letters Patent.

Patented May 18, 1215.

Application filed January 20, 1912. Serial No. 672,503. I

To all whom it may concern Be it known that I, DAVID F. DOMIZI, citizenof the United States, residing at Franklin, in the county of Venango andState of Pennsylvania, have invented certain new and useful Improvementsin Machines for Grinding the Lateral Faces of Piston-Rings, of which thefollowing is a specification.

The object, application, construction and operation of my improvedgrinding machine for the lateral faces of piston rings are herein setforthwith suflicient clearness to enable those skilled in the art towhich it appertains, to make and use the same.

In the manufacture of snap rings for the pistons of high speed motors,such as are used in automobiles, motor boats, etc., it is necessary thatthe rings be accurately finished, and especially that the width of thering be such as to accurately and nicely fit the groove made to receivethe same in the piston. In order to properly accomplish mandrel andhaving their juxtaposed, lateral faces arranged to simultaneously grindthe two lateral faces or edges of the piston ring, or any similararticle, said mandrel being revolubly mounted in any suitable frame orbed adapted to be attached to a suitable machine tool provided with achuck for receiving and revolving the ring as the edges are being ground7 by said abrasive wheels.

In the form in which I have here shown my machine, it is designed and.adapted to be applied to a lathe, but this is merely one of severalpossible adaptations of the same, as it may be applied to other standardtypes of machine tools, as well as to a specially constructed machinefor this purpose alone.

One form of construction of my improved I the mandrel and the attachedwheels; this view being included more for the purpose of showing merelyessential elements, rather than actual construction; Fig. 2 is amodified form of mandrel and the one which I prefer to usually employ,though it difiers but little from Fig. 2; Fig. 3 is a transverse sectionupon line III III of Fig. 2*; Fig. 4

is a transverse section upon line IV IV of wheels, 1 and 2, are mountedside by side upon a single mandrel, which is composed of a non-revolubleshaft 3 and a compound revoluble sleeve, consisting of the member 4:,

to which wheel 1 is attached, and member 5 to which wheel 2 is attached;sleeve 5 is longitudinally adjustable upon sleeve l, and said sleevesare caused to revolve in unison by means of the splineB. Saidlongitudinal adjustability of sleeve 5 and its attached wheel 2, is forthe purpose of providing a lateral adjustment of said wheel, and forvarying the width of the space or gap 7 between the wheels 1 and 2, andby which the desired width of the piston ring is secured. Means foraccomplishing this adjustment consists of the externally-threaded sleeve8, which passes through an internallythreaded nut 9, that is revolublymounted in the bearing 101 A hand-wheel 11 is aflixed to said nut, forthe purpose of revolving same'when an adjustment is to be made. Achamber 12 is formed in the sleeve for the reception of a spring 13,which bears at one end upon sleeve 4 and at the other end upon a portionof sleeve 5, and prevents any unintended, relative, longitudinalmovement thereof. Said spring also moves wheel 2 and sleeve 5 towardsleeve 8, when said sleeve 8 is retracted in making adjustments. Saidspring also serves to automatically maintain the adjustment of saidwheels and sleeves, as against any wear in the thread of sleeve 8 or thethrust-bearing 14, which might otherwise and without said spring tendtocause inaccuracies by a possible relative lateral play of the wheels 1and 2. Any suitable dust-proof joint, as a telescopic joint 15, may beprovided upon the sleeves 4 and 5, between the wheels, for the purposeof excluding abrasive material from the wearing surface of the sleevesand shaft 3.

. The bearings 10 and 16 are an integral por- 7 wheels 1 and 2 and themandrel are mount-'- ed; a pulley 18 is attached tosleeve 5, for

the wheels :are 'driven.

In Fig. 2 I have shown amodified form of mandrel, which is essentiallythe same asFig. 2, except that I have provided a somewhat more minuteadjusting means than I have shown in Fig. 2. I have also provided adiiferent arrangement of-spring 13, which is designated 18 in Fig. 2'Sp'e-' cifically set forth, the construction shown'in Fig. 2 is asfollows: 1and2 are the abrasive or grinding wheels, 3is the nonrevoluble shaft, 4 and 5 are the respective sleeves of the compoundmandrel. Theoflice of the key or spline 6 is perz'tormed by "the rods 6,which rods also have another ofiice to be presently setforth; 8 is .anadjusting sleeve, which is longitudinally movable, said movement beingaccomplished in one direction, by means ofthe worm-wheel nut '9, and inthe other, by thereac'tion or expansion of spring 135;, a worm 11, whichengages wheel 9, is employedrfor revolving said wheel. Sleeve'8bearsagainst the con-' tiguous end of sleeve 5 through the medium of theanti-friction washers 14:. A housing. crease 19 is non-revolubly fixedin the bearing 10, in which worm .11" is mounted, and

, said housing is extended in the direction of the wheels, inthe form ofthe sleeve, for the purpose of excluding .fine particles of abrasivematerial from the thrust-bearing 14.

The application of spring 13ndi1iers from the application of spring 13of Fig, 2, in

the following particulars: Said sprlng is [located upon the outside ofsleeve 5, and

bears at the inner end against the annulus 20, which annulus, in 'turn,bears against the outer end of rods 6, that passl'oosely through thewheel-flange'2l of sleeve 5.

The, inner ends of rods '6' are "firmly ;se

cured in theother wheel fiange '22. The outer end of spring 13" bearsagainst a collar 23, which is connected by means of a screw-thread tosleeve 5.

The reaction or expansive tendency of springs '13 "causes sleeve 5 tobear forcibly against the adjusting 'sleeve8,,through the medium'of thethrust-bearing 14, as aforesaid. The tension or expansive force of thespring, "and the consequent pressure of sleeve 5aga1nst sleeve 8, mayberegulated by the position of colcauses a separating "tendency betweenthe wheels .1 and 2, and thereby accomplishes the same automatic take-upof wear that is secured by means of the' s pring' in Fig.2.

A suitable'hand-wheel 11" is provided for the manipulation of worm 11".Graduations ,areFfOrmed upon said wheel 11 ,'and an in-.

d'ex lfl wis attached-tosleeve 19, andzis provided witha point which ispositioned in close proximity to said graduations, to'inhere shown. :theslide 2 1, accomplished "by meansyof the handle 25,is"-the one wherebythe feed of'my device is accomplished, or, in other words, this isthe'prov'ision whereby wheels '1 and This "action of said spring alsodicate the passage and location of same,

.andthe degree ofadjustment being made. the reception of a driving belt,whereby A suitable anti-friction or thrust-bearing 1:4 isgprovided'for,sleeve 4, which, 1n Fig. 2 is shown asa plurality of washers, and,

byaaltering the thickness or number of said washers, a certain amount oflongitudinal adjustment of said sleeve 1 or lateral adjustment of wheel1 is provided for.

In Fig. 5, Ihave shown my machine attached to the slide-rest 24: of alathe, and

'from an inspection of this view, it will be apparent that thegrinding-wheels are adapted to be moved toand awayfrom their work bymeans of the'crossfeed'25, the same as an ordinaryjlathe-tool. The ring20 is shown in dotted "lines in Fig. 5, and for the purpose 'of' holdingthe ring while being finished, "I prefer to use the chuck showndescribed by me in a certain -ap lication forLet'ters-Patent'of theUnited tates,

filed April 21 1911, Serial 'No. 622,579;

I have shown frame 17 extended and adapted for the; attachment of acertain.

gage-tool 27 which is "fully described in a certain-application forLetters Patent filed "by me on the 20" day.o-f' January, :1912,

Serial "No. 672,502.

As Eis wen known, the saddle '28 or alllathes is-movable longitudinallyof the bed,

:a-nd'the'slide or tool-rest 24, to which my device is attached, ismovable upon the "sadbeutilized, is provided in the construction Thetransverse movement of 2 aremoved intothe operative position and intocontact with theworkgto be done, and removedftherefrom.

I attach my devicefito the rest '24"1in;any 1 convenient way 'orsuitable-means, the means here shown being a bolt '29, the head ofwhichis-inserted into .the'toolostlslet '30 and passed through an eyeuponithe-can' riage or frame 1 1. In a inachine for grinding the lateraledges er piston rings, the combination of awe abrasive wheelsadj-us'ta'bly mounted upon one mandrel, and arranged for simulta'neously grinding the lateral edges or a piston ring, a frame for saidwheels arranged to be movable in a line transverse to the Tfi'XlSof-said wheels, and means 'for revolving suhrin'g during the grinding operatio'n. I

lateral faces of such ring, and means for varying the distance betweensaid contiguous faces, a frame in which said wheels are mounted, movablein a line transverse to the axis of said wheels, and means revolvingsuch ring during the grinding operation.

3. In a machine for grinding the lateral faces of piston rings, thecombination with two abrasive wheels contiguously mounted upon amandrel, and relatively adjustable thereon, of a frame arranged for theoperative reception of said mandrel and wheels, and for their attachmentto a suitable machine tool, having a Work-spindle or live center wherebysaid wheels are adapted to operate upon a ring, when revolved by saidspindle.

4. In a machine for grinding the lateral faces of piston rings, thecombination with the slide-rest, of a lathe, which lathe is equippedwith means for holding and revolving such ring during the grindingoperation, of a frame attached to said rest,

and movable therewith, a mandrel revolubly mounted in said frame,abrasivewheels contiguously and adjustably mounted upon said mandrel,means for varying the contiguity of said wheels, and means for drivingsaid wheels.

5. In amachine for grinding the lateral faces of piston rings, thecombination of two abrasive wheels, contiguously, adjustably mountedupon a mandrel, and arranged to simultaneously grind the lateral facesof such ring, means for varying the degree of said contiguity, meansindicating the amount of said variation and means automatically 7preventing possible relative, lateral play between wheels, which mightbe caused by wear of operative parts.

In testimony whereof I alfix my signature in presence of two witnesses.

DAVID F. DOMIZI. Witnesses:

AGNES WHALEN, E. R. INMAN.

Gopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

